[ClusterLabs] Antw: [EXT] Stonith failing

[Ken Gaillot]

On Mon, 2020-08-17 at 22:39 +0200, Jehan-Guillaume de Rorthais wrote:
> On Mon, 17 Aug 2020 10:19:45 -0500
> Ken Gaillot <kgaillot at redhat.com> wrote:
> 
> > On Fri, 2020-08-14 at 15:09 +0200, Gabriele Bulfon wrote:
> > > Thanks to all your suggestions, I now have the systems with
> > > stonith
> > > configured on ipmi.  
> > 
> > A word of caution: if the IPMI is on-board -- i.e. it shares the
> > same
> > power supply as the computer -- power becomes a single point of
> > failure. If the node loses power, the other node can't fence
> > because
> > the IPMI is also down, and the cluster can't recover.
> > 
> > Some on-board IPMI controllers can share an Ethernet port with the
> > main
> > computer, which would be a similar situation.
> > 
> > It's best to have a backup fencing method when using IPMI as the
> > primary fencing method. An example would be an intelligent power
> > switch
> > or sbd.
> 
> How SBD would be useful in this scenario? Poison pill will not be
> swallowed by
> the dead node... Is it just to wait for the watchdog timeout?

Right, I meant watchdog-only SBD. Although now that I think about it,
I'm not sure of the details of if/how that would work. Klaus Wenninger
might have some insight.
-- 
Ken Gaillot <kgaillot at redhat.com>